Centering device.



Patented May18, 1915.

.www

A. CROOK.

CENTERING DEVICE.

APPLICATION ULEB AuG.12. 1914.

www

un r/ulerrls PETERS Co., PHOTO L/THo.. wASHlNGroN. D C.

UNITED sTATEs PATENT oEEIoE. g

AIEEED oizooK, 0E HILADELEHIA ENNsEEVANIA,-AssIeNoR lTo lJiniLADE EEHIA EoLI. AND MACHINE COMPANY, 0E `EnIIAIDELDIITA,V PENNSYLVANIA, A ooREoItA-v TIoN oE PENNSYLVANIA.

T0 all 'whom 'it may concern Be it known that I, ALFRED CRooK, a citizen ofthe United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Centering Devices, of which the following is a specication.

One object of my invention is to provide a relatively simple, substantial and conveniently operative device whereby shafts, rolls` or other structures of cylindrical or substantially cylindrical form may be quickly centered in a lathe, the construction of the device being such as to permit of its easyV application to lathes without requiring'their material alteration, l

Ther invention also contemplates an inexpensive combination ofparts which shall accurately accomplish the above noted end.

`These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings in which -Figure 1 is aside elevation of a lathe showing my invention as applied thereto, and Fig. 2 is a vertical section of the line a-a, Fig. l.

In the above drawings 1 represents the foundation of a lathe particularly designed for turning rolls and on this is mounted the frame work proper which consists of a pair of side members 2 of suitable cross section rigidly connected at intervals by crossbraces 8. On these v.side members 2 are mounted the head and tail stocks land 5 of the lathe, of which the first is provided with any desired form of driving and change speed mechanism and carries a driving face plate 6 and center 7. The tail stock is like' wise provided with a tail-shaft 8 to which is fixed a face plate 9 carrying radially adjustable jaws 10. Any suitable means, forming no part of the present invention, may be 4employed to cause a roll XY to Ybe positively driven from the face plate 6 and any desired form of tool carriageis also provided, but it is omitted from the drawings since it also forms no part of the present invention.

Slidably mounted on the frame members 2 is the centering device which includes a transversely extending frame l2 having recesses for the reception of the top portions of said side members, it being noted that its central portion is depressed rbetween these members. Each side of the frame 1.2 is provided with bearings for the reception of horizontally threaded shafts113-and 14Cv speicauon of Letters Patent.

CENTERING DEVICE. v

mounted in 1in@ with mh- Other andrei@ Patentediuay 1s, 1915. Application filed August 12, 1914. SerialjNo. 856,471.,

threaded lportions for the y'reception ofthe shafts 13 and 14 respectively.. The Madja# cent faces of the jaws are made plane and said Vj-aws may be precisely similarthough I preferably make the upper part of the first of them" in the form of an auxiliary'jaw v2O which after the centering .has been accomplished may be replaced by any desired form of tool holder or carriage. The auxiliary jaw has a plane face lying in the plane of the main face of the jaw 18, and held in place by a downwardly projecting lug of -section, rwhich fits within a correspond? ingly formed groove in the top face of said main jawv which as-*above noted may also serve as a tool post or support. By means Iso of this. lug-and-groove connection the auxiliary aw is rmly held and when said jaw is removed, the holding bolt or bolts of the tool carriage may be inserted therein.

The central downwardly extending portion 22 of the framel2 is provided with a passage in `which a threaded shaft 23 is longitudinally guidedfwhile being held from revolution by a suitable key or spline and there is splined to it a beveled gear 24C supported by the frame insuch position that it meshes with both of the beveled pinions` 16 and 17. This shaft 23 carries ahead ,25'

formed with a plane top face lying at right angles with the `planes of the of the two jaws 18 and 19.

. Under conditions` of use a roll, shaft, orv other cylindrical body vto be turned would be provided witha central hole or recess4 at that end which is to be engaged by the jaws or dogk of the face plate 6 of the lathe. The

adjacent faces j roll would then be lowered over the lathe l body and adjusted until the center 7 entered said hole, the roll'at this time preferably having its opposite end somewhat higher than this centered end and extending be-` These latterV tween the jaws 18 and 19. would then be simultaneously moved toward each other by revolution of .the handwheel 15, it being obvious thatl such revolution would be transmitted l from thefscrew 1,34

i through ythe jaws 18and19 are moved away from the roll andthe auxiliary jawV 20 replaced by a tool holder and ttoolby which the turning operation may Vbecarried out.

From the above description 'it vwill 'be noted that the centering'of. even theheaviest structures may 'be' accomplished 4in `an yexceedingly vshorttimeand with adegree of accuracy depending only'lupon the perfection of .the construetionjofapparatusconstituting my invention.; Thereafter by vInoving backwthe member 18k and mounting a suitable tooll thereon; the roll' or other 'piece of work may be turned"inthe"'well known manner. l

1. The combination in a centering device of a supporting frame'open'at the top; two jaws mounted onfthe frame and ffmovab'le horizontally toward and from 'each other; mechanism connecting the jaws; with'a centering head actuated by"said"mechanism and placedy `to supportl a'ny *obj 'ectA vmounted between said jaws. j

2. A combination'in apenteringdevice of a supporting'frame open at thel top; 'two jaws mounted thereon andmovable vhorizontally toward and from'eachother; mechanism fortsimil'ltaneously moving vsaidjaws including gearing; and a centening head placed' lto support' an Vobj ect entered between the jaws and movablejby said gearing ina line at right angles tothe line of movement of said jaws.

'3. The combination Vin a rcentering 'device of a supporting structure; three centering members thereon ;l and `means for simultaneously moving said members Vconsisting of three intermeshing' gears; vthreaded spindles rigidly iiXed to twoY 'of' said gears and threaded in two of `the 'members respectively; with a' threaded spindle attached to the thirdmember and threaded 4through the third gear.

ratones an article entered between the jaws; with means for simultaneously moving the jaws and the centering head.

5. The combination in acen'tering device of a supporting frame; two jaws slidably mounted thereon; shafts threaded respectively through said jaws; gears respectively connected lto said shafts; a third gear rotatable in a plane at right angles to the plane of the other shafts and jaws; a centering head; with athird' shaft threaded 'through the third gear'and carrying said centering head.

--'6. The ycombina-tion in a vla-the centering device of Aa supporting'frame; two ljaws slidafblyr mounted thereon; threaded shafts respectively connected to'saidjaws; a beveled gear on yeach vof said shafts; al third beveled "gear `-ope1'atively connecting said shaft-carried gears; a *third shaft threaded through said thi-rd gear; and a centering head carried by said third shaft.

' 7. The vcombination in a -la-the ycentering device of a frame; two 'threaded shafts mounted in bearings on said frame and eX- tending Vin Vsubstantially the same l vstraight line;awsfs'lidable1on the' iframe and having threaded portions engaging said shafts respectively; 'beveled gears vrespectively connected to the-said shafts; a third vbeveled gear connecting said shaft carried lgears; a third Vthreaded shaft vcarried by the frame andlsplinedto the third'beveled gear; a centering head carried by the thi-rdy shaft; and means for simultaneously turning said shafts at will.

8. The combination in a centering device of 1 a supporting 'f frame ;1y twov jaws mounted on theiframe and-movable toward and from each other mechanism connecting 7the jaws and'` a` centering lhead actuatedby said mechanism-,one'of said jaws consisting of a main and JauX-iliaryportion and said-auxiliary portion being' removable.

9. The l'coi'nbinati'on in a centering -device of"a-supporting`frame; two jaws mounted on the frameand ymovable toward and from each other Amechanism connecting' the jaws; arid a` centering "head actuated by said mechanism, oneof'said jaws consisting of a'main" portion'having A'an under-cut slot, with anauxiliary portion having a headed lug'fi'ttingsaidfslot and formedwith a plane face continuous with a plane/face'- ofl said main portion of the jaw.

1n testimony "whereof,'1 have signed my name tol'thisspecitication; in the presence ofy two 'subscribing witnesses.

ALFRED CRGOK.

Witnesses: w

`VVIL'LIAM E; BRADLEY,

BARR.

Washingtomnc. Y 

